Canadian mining journal July-December 1915 . COVERS THE CONTINENT^ EVERY product sold under this emblem is backedby J-M Responsibility—a new order of Servicepledged by a nation-wide organization that hashad over half a century of experience in solving yourproblems. J-M Products are made not merely to sell but to givesatisfaction in use. Hundreds of J-M Service Repre-sentatives everywhere give this assurance. That - J-MResponsibility. M Asbestos Roofings put an end to your Roofing Expense. These roofings are non-corrosive as wellas weather-proof and time-proof and willlast for a generation. Som
Canadian mining journal July-December 1915 . COVERS THE CONTINENT^ EVERY product sold under this emblem is backedby J-M Responsibility—a new order of Servicepledged by a nation-wide organization that hashad over half a century of experience in solving yourproblems. J-M Products are made not merely to sell but to givesatisfaction in use. Hundreds of J-M Service Repre-sentatives everywhere give this assurance. That - J-MResponsibility. M Asbestos Roofings put an end to your Roofing Expense. These roofings are non-corrosive as wellas weather-proof and time-proof and willlast for a generation. Some in use for twenty to thirty years—and still good ! Contain no organic material—made onlyof Asbestos Fibre and Trinidad Lake As-phalt. Never needs painting. Are fire re-tardant almost to a fire-proof degree, andnon-conducting. Furnished in Built-up type for flatroofs and in Prepared type for slopingroofs. J-M Asbestos Built-up Roofing has asmooth surface and is very much lighterthan Miami Copper (<??. Miami. Ari: Your own men can easily lay T-M Asbestos Ready Roofing with J-M Vise-Grip BootingCleats and make a perfect job. Register your J-M Roof with us and we will see that it gives you fullResponsibility. Ask about this. srvice under .1-M Roorina Its not only temperature that breaks down yourBoiler Settings—but change of temperature. The fire brick and clay you are using may not be severely taxed by the t< mpt r-ature of your boiler furnace. The}* perhaps withstand the greatest working heat you need—but Should it be necessary to force your boilers to their limit, then your furnace tem-perature rises accordingly. A little later someone opens the tire door, to coal, sli Ior clean the fire and in rushes a draught of cold air. What happens ? Everythingin the furnace contracts. Fire clay cant stand this, it isnt structurally adapted to contraction and expansion. Itcrumbles out and disintegrates under these conditions. J-M No. 31 High Temperature Ce
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
